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This command is equal to `SDIFF`, but instead of returning the resulting set, it
is stored in `destination`.
If `destination` already exists, it is overwritten.
@return
@integer-reply: the number of elements in the resulting set.
@examples
```cli
SADD key1 "a"
SADD key1 "b"
SADD key1 "c"
SADD key2 "c"
SADD key2 "d"
SADD key2 "e"
SDIFFSTORE key key1 key2
SMEMBERS key
```
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